Sickness experience in selected areas of the United States : data on illness, by severity, for 100 diagnoses collected by periodic canvasses of households, with 100,000 person-years of observation / Selwyn D. Collins, Katharine S. Trantham, Josephine L. Lehmann.
Collins, Selwyn D. (Selwyn De Witt), 1891-1959. | Date: 1955]